diff --git a/crypto/bls12381/g1.go b/crypto/bls12381/g1.go
index 52e12cc3a..bcb898027 100644
--- a/crypto/bls12381/g1.go
+++ b/crypto/bls12381/g1.go
@@ -247,7 +247,7 @@ func (g *G1) Affine(p *PointG1) *PointG1 {
 
 // Add adds two G1 points p1, p2 and assigns the result to point at first argument.
 func (g *G1) Add(r, p1, p2 *PointG1) *PointG1 {
-	// http://www.hyperelliptic.org/EFD/gp/auto-shortw-jacobian-0.html#addition-add-2007-bl
+	// www.hyperelliptic.org/EFD/g1p/auto-shortw-jacobian-0.html#addition-add-2007-bl
 	if g.IsZero(p1) {
 		return r.Set(p2)
 	}
@@ -295,7 +295,7 @@ func (g *G1) Add(r, p1, p2 *PointG1) *PointG1 {
 
 // Double doubles a G1 point p and assigns the result to the point at first argument.
 func (g *G1) Double(r, p *PointG1) *PointG1 {
-	// http://www.hyperelliptic.org/EFD/gp/auto-shortw-jacobian-0.html#doubling-dbl-2009-l
+	// http://www.hyperelliptic.org/EFD/g1p/auto-shortw-jacobian-0.html#doubling-dbl-2009-l
 	if g.IsZero(p) {
 		return r.Set(p)
 	}
diff --git a/crypto/bls12381/g2.go b/crypto/bls12381/g2.go
index c2ca959bc..4d6f1ff11 100644
--- a/crypto/bls12381/g2.go
+++ b/crypto/bls12381/g2.go
@@ -267,7 +267,7 @@ func (g *G2) Affine(p *PointG2) *PointG2 {
 
 // Add adds two G2 points p1, p2 and assigns the result to point at first argument.
 func (g *G2) Add(r, p1, p2 *PointG2) *PointG2 {
-	// http://www.hyperelliptic.org/EFD/gp/auto-shortw-jacobian-0.html#addition-add-2007-bl
+	// http://www.hyperelliptic.org/EFD/g1p/auto-shortw-jacobian-0.html#addition-add-2007-bl
 	if g.IsZero(p1) {
 		return r.Set(p2)
 	}
@@ -315,7 +315,7 @@ func (g *G2) Add(r, p1, p2 *PointG2) *PointG2 {
 
 // Double doubles a G2 point p and assigns the result to the point at first argument.
 func (g *G2) Double(r, p *PointG2) *PointG2 {
-	// http://www.hyperelliptic.org/EFD/gp/auto-shortw-jacobian-0.html#doubling-dbl-2009-l
+	// http://www.hyperelliptic.org/EFD/g1p/auto-shortw-jacobian-0.html#doubling-dbl-2009-l
 	if g.IsZero(p) {
 		return r.Set(p)
 	}